ardour 2.7 make segmentation fault

[t-u-t]

hi, i cannot build ardour 2.7 on 7.1beta2 amd64. any clues?
(pkg is vers 2.4.1_1)

libs/ardour/audio_diskstream.cc: In constructor
'ARDOUR::AudioDiskstream::ChannelInfo::ChannelInfo(nframes_t, nframes_t,
nframes_t)':
libs/ardour/audio_diskstream.cc:2452: internal compiler error: Segmentation
fault: 11
Please submit a full bug report,
with preprocessed source if appropriate.
See <URL:http://gcc.gnu.org/bugs.html> for instructions.
scons: *** [libs/ardour/audio_diskstream.os] Error 1
scons: building terminated because of errors.
*** Error code 2

Stop in /usr/ports/audio/ardour.
*** Error code 1

-- 
ce la vie